Description of the bug :

Starting from Windows 10 2004 the GlobalSystemMediaTransportControlsSessionManager is broken and the GlobalSystemMediaTransportControlsSessionManager.SessionsChanged event is not firing properly.

Meaning that the session controls won't be upated whenever an app opens/closes (e.g. Test yourself with Groove Music) & etc.
This makes the session controls (which is a very important feature of this app) useless. But the built-in flyout works somehow.

Source :
Manual verification and from our collaborator @ADeltaX (in ADeltaX/AudioFlyout#12)

Also I heard that GSMTC as WinRT api is broken in 19041.x (doesn't get notified when an app closes SMTC (e.g. when you close Groove Music))

Current Workaround :

Restarting the app updates the sessions (won't update again we have to restart again to update).

Expected behaviour :

The app updates itself whenever the GSMTC sessions are updated.

Proposed method :

If can't provide any programmatic fix, at-least provide an update button to refresh them manually. Instead of forcing users to restart the app and making things complex.